A two-component system in Ralstonia (Pseudomonas) solanacearum modulates production of PhcA-regulated virulence factors in response to 3-hydroxypalmitic acid methyl ester

Expression of virulence factors in Ralstonia solanacearum is controlled by a complex regulatory network, at the center of which is PhcA, a LysR family transcriptional regulator. We report here that expression phcA and production of PhcA-regulated virulence factors are affected by products of the put...

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Veröffentlicht in:Journal of Bacteriology 1997-06, Vol.179 (11), p.3639-3648
Hauptverfasser: Clough, S.J. (University of Illinois, Urbana, IL.), Lee, K.E, Schell, M.A, Denny, T.P
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container_issue 11
container_start_page 3639
container_title Journal of Bacteriology
container_volume 179
creator Clough, S.J. (University of Illinois, Urbana, IL.)
Lee, K.E
Schell, M.A
Denny, T.P
description Expression of virulence factors in Ralstonia solanacearum is controlled by a complex regulatory network, at the center of which is PhcA, a LysR family transcriptional regulator. We report here that expression phcA and production of PhcA-regulated virulence factors are affected by products of the putative operon phcBSR(Q). phcB is required for production of an extracellular factor (EF), tentatively identified as the fatty acid derivative 3-hydroxypalmitic acid methyl ester (3-OH PAME), but a biochemical function for PhcB could not be deduced from DNA sequence analysis. The other genes in the putative operon are predicted to encode proteins homologous to members of two-component signal transduction systems: PhcS has amino acid similarity to histidine kinase sensors, whereas PhcR and OrfQ are similar to response regulators. PhcR is quite unusual because its putative output domain strongly resembles the histidine kinase domain of a sensor protein. Production of the PhcA-regulated factors exopolysaccharide I, endoglucanase, and pectin methyl esterase was reduced 10- to 100-fold only in mutants with a nonpolar insertion in phcB [which express phcSR(Q) in the absence of the EF]; simultaneously, expression of phcA was reduced fivefold. Both a wild-type phenotype and phcA expression were restored by addition of 3-OH PAME to growing cultures. Mutants with polar insertions in phcB or lacking the entire phcBSR(Q) region produced wild-type levels of PhcA-regulated virulence factors. The genetic data suggest that PhcS and PhcR function together to regulate expression of phcA, but the biochemical mechanism for this is unclear. At low levels of the EF, it is likely that PhcS phosphorylates PhcR, and then PhcR interacts either with PhcA (which is required for full expression of phcA) or an unknown component of the signal cascade to inhibit expression of phcA. When the EF reaches a threshold concentration, we suggest that it reduces the ability of PhcS to phosphorylate PhcR
doi_str_mv 10.1128/jb.179.11.3639-3648.1997
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The other genes in the putative operon are predicted to encode proteins homologous to members of two-component signal transduction systems: PhcS has amino acid similarity to histidine kinase sensors, whereas PhcR and OrfQ are similar to response regulators. PhcR is quite unusual because its putative output domain strongly resembles the histidine kinase domain of a sensor protein. Production of the PhcA-regulated factors exopolysaccharide I, endoglucanase, and pectin methyl esterase was reduced 10- to 100-fold only in mutants with a nonpolar insertion in phcB [which express phcSR(Q) in the absence of the EF]; simultaneously, expression of phcA was reduced fivefold. Both a wild-type phenotype and phcA expression were restored by addition of 3-OH PAME to growing cultures. Mutants with polar insertions in phcB or lacking the entire phcBSR(Q) region produced wild-type levels of PhcA-regulated virulence factors. 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(University of Illinois, Urbana, IL.)</creatorcontrib><creatorcontrib>Lee, K.E</creatorcontrib><creatorcontrib>Schell, M.A</creatorcontrib><creatorcontrib>Denny, T.P</creatorcontrib><title>A two-component system in Ralstonia (Pseudomonas) solanacearum modulates production of PhcA-regulated virulence factors in response to 3-hydroxypalmitic acid methyl ester</title><title>Journal of Bacteriology</title><addtitle>J Bacteriol</addtitle><description>Expression of virulence factors in Ralstonia solanacearum is controlled by a complex regulatory network, at the center of which is PhcA, a LysR family transcriptional regulator. We report here that expression phcA and production of PhcA-regulated virulence factors are affected by products of the putative operon phcBSR(Q). phcB is required for production of an extracellular factor (EF), tentatively identified as the fatty acid derivative 3-hydroxypalmitic acid methyl ester (3-OH PAME), but a biochemical function for PhcB could not be deduced from DNA sequence analysis. The other genes in the putative operon are predicted to encode proteins homologous to members of two-component signal transduction systems: PhcS has amino acid similarity to histidine kinase sensors, whereas PhcR and OrfQ are similar to response regulators. PhcR is quite unusual because its putative output domain strongly resembles the histidine kinase domain of a sensor protein. Production of the PhcA-regulated factors exopolysaccharide I, endoglucanase, and pectin methyl esterase was reduced 10- to 100-fold only in mutants with a nonpolar insertion in phcB [which express phcSR(Q) in the absence of the EF]; simultaneously, expression of phcA was reduced fivefold. Both a wild-type phenotype and phcA expression were restored by addition of 3-OH PAME to growing cultures. Mutants with polar insertions in phcB or lacking the entire phcBSR(Q) region produced wild-type levels of PhcA-regulated virulence factors. The genetic data suggest that PhcS and PhcR function together to regulate expression of phcA, but the biochemical mechanism for this is unclear. At low levels of the EF, it is likely that PhcS phosphorylates PhcR, and then PhcR interacts either with PhcA (which is required for full expression of phcA) or an unknown component of the signal cascade to inhibit expression of phcA. 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(University of Illinois, Urbana, IL.)</creator><creator>Lee, K.E</creator><creator>Schell, M.A</creator><creator>Denny, T.P</creator><general>American Society for Microbiology</general><scope>FBQ</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QL</scope><scope>7TM</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>M7N</scope><scope>P64</scope><scope>RC3</scope><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>19970601</creationdate><title>A two-component system in Ralstonia (Pseudomonas) solanacearum modulates production of PhcA-regulated virulence factors in response to 3-hydroxypalmitic acid methyl ester</title><author>Clough, S.J. (University of Illinois, Urbana, IL.) ; Lee, K.E ; Schell, M.A ; Denny, T.P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c642t-ddadff27f130b50aef155a72bcd66a32563f118d5d69e702b302f1431fd3d1ad3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1997</creationdate><topic>ACIDE GRAS</topic><topic>ACIDOS GRASOS</topic><topic>ADN</topic><topic>Amino Acid Sequence</topic><topic>AMINO ACID SEQUENCES</topic><topic>BACTERIA</topic><topic>Bacterial Proteins</topic><topic>Bacteriology</topic><topic>BINDING PROTEINS</topic><topic>CELLULASE</topic><topic>CELULASA</topic><topic>CHEMICAL COMPOSITION</topic><topic>COMPOSICION QUIMICA</topic><topic>COMPOSITION CHIMIQUE</topic><topic>DNA</topic><topic>DNA-Binding Proteins - genetics</topic><topic>ESTER</topic><topic>ESTERES</topic><topic>ESTERS</topic><topic>EXPRESION GENICA</topic><topic>EXPRESSION DES GENES</topic><topic>EXTRACELLULAR FACTOR</topic><topic>FACTEUR DE TRANSCRIPTION</topic><topic>FACTORES DE TRANSCRIPCION</topic><topic>FATTY ACIDS</topic><topic>GENBANK/U6193[SIC]</topic><topic>GENE</topic><topic>GENE EXPRESSION</topic><topic>Gene Expression Regulation, Bacterial - drug effects</topic><topic>GENES</topic><topic>Genes, Bacterial</topic><topic>GENETIC REGULATION</topic><topic>GENETICA</topic><topic>GENETICS</topic><topic>GENETIQUE</topic><topic>Gram-Negative Aerobic Bacteria - genetics</topic><topic>Gram-Negative Aerobic Bacteria - pathogenicity</topic><topic>HISTIDINE KINASE</topic><topic>MOLECULAR SEQUENCE DATA</topic><topic>MUTACION</topic><topic>MUTANT</topic><topic>MUTANTES</topic><topic>MUTANTS</topic><topic>MUTATION</topic><topic>NUCLEOTIDE SEQUENCE</topic><topic>Palmitates - pharmacology</topic><topic>PECTINESTERASAS</topic><topic>PECTINESTERASE</topic><topic>PHCB GENE</topic><topic>PHCR GENE</topic><topic>PHCS GENE</topic><topic>POLISACARIDOS</topic><topic>POLYHOLOSIDE</topic><topic>POLYSACCHARIDES</topic><topic>PROTEIN KINASE</topic><topic>PROTEIN SYNTHESIS</topic><topic>PROTEINA QUINASA</topic><topic>PROTEINAS</topic><topic>PROTEINAS AGLUTINANTES</topic><topic>PROTEINE</topic><topic>PROTEINE DE LIAISON</topic><topic>PROTEINE KINASE</topic><topic>PROTEINS</topic><topic>PSEUDOMONACEAE</topic><topic>Ralstonia solanacearum</topic><topic>RALSTONIAN SOLANACEARUM</topic><topic>REGULATORY GENES</topic><topic>SECUENCIA NUCLEOTIDICA</topic><topic>Sequence Analysis</topic><topic>SEQUENCE NUCLEOTIDIQUE</topic><topic>SINTESIS DE PROTEINAS</topic><topic>STRUCTURAL GENES</topic><topic>SYNTHESE PROTEIQUE</topic><topic>TRANSCRIPTION FACTORS</topic><topic>Transcription Factors - genetics</topic><topic>Virulence - genetics</topic><topic>Viruses</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Clough, S.J. (University of Illinois, Urbana, IL.)</creatorcontrib><creatorcontrib>Lee, K.E</creatorcontrib><creatorcontrib>Schell, M.A</creatorcontrib><creatorcontrib>Denny, T.P</creatorcontrib><collection>AGRIS</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Nucleic Acids Abstracts</collection><collection>Virology and AIDS Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Journal of Bacteriology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Clough, S.J. (University of Illinois, Urbana, IL.)</au><au>Lee, K.E</au><au>Schell, M.A</au><au>Denny, T.P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A two-component system in Ralstonia (Pseudomonas) solanacearum modulates production of PhcA-regulated virulence factors in response to 3-hydroxypalmitic acid methyl ester</atitle><jtitle>Journal of Bacteriology</jtitle><addtitle>J Bacteriol</addtitle><date>1997-06-01</date><risdate>1997</risdate><volume>179</volume><issue>11</issue><spage>3639</spage><epage>3648</epage><pages>3639-3648</pages><issn>0021-9193</issn><eissn>1098-5530</eissn><eissn>1067-8832</eissn><coden>JOBAAY</coden><abstract>Expression of virulence factors in Ralstonia solanacearum is controlled by a complex regulatory network, at the center of which is PhcA, a LysR family transcriptional regulator. We report here that expression phcA and production of PhcA-regulated virulence factors are affected by products of the putative operon phcBSR(Q). phcB is required for production of an extracellular factor (EF), tentatively identified as the fatty acid derivative 3-hydroxypalmitic acid methyl ester (3-OH PAME), but a biochemical function for PhcB could not be deduced from DNA sequence analysis. The other genes in the putative operon are predicted to encode proteins homologous to members of two-component signal transduction systems: PhcS has amino acid similarity to histidine kinase sensors, whereas PhcR and OrfQ are similar to response regulators. PhcR is quite unusual because its putative output domain strongly resembles the histidine kinase domain of a sensor protein. Production of the PhcA-regulated factors exopolysaccharide I, endoglucanase, and pectin methyl esterase was reduced 10- to 100-fold only in mutants with a nonpolar insertion in phcB [which express phcSR(Q) in the absence of the EF]; simultaneously, expression of phcA was reduced fivefold. Both a wild-type phenotype and phcA expression were restored by addition of 3-OH PAME to growing cultures. Mutants with polar insertions in phcB or lacking the entire phcBSR(Q) region produced wild-type levels of PhcA-regulated virulence factors. The genetic data suggest that PhcS and PhcR function together to regulate expression of phcA, but the biochemical mechanism for this is unclear. At low levels of the EF, it is likely that PhcS phosphorylates PhcR, and then PhcR interacts either with PhcA (which is required for full expression of phcA) or an unknown component of the signal cascade to inhibit expression of phcA. When the EF reaches a threshold concentration, we suggest that it reduces the ability of PhcS to phosphorylate PhcR</abstract><cop>United States</cop><pub>American Society for Microbiology</pub><pmid>9171411</pmid><doi>10.1128/jb.179.11.3639-3648.1997</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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identifier ISSN: 0021-9193
ispartof Journal of Bacteriology, 1997-06, Vol.179 (11), p.3639-3648
issn 0021-9193
1098-5530
1067-8832
language eng
recordid cdi_fao_agris_US1997048933
source MEDLINE; EZB-FREE-00999 freely available EZB journals; PubMed Central
subjects ACIDE GRAS
ACIDOS GRASOS
ADN
Amino Acid Sequence
AMINO ACID SEQUENCES
BACTERIA
Bacterial Proteins
Bacteriology
BINDING PROTEINS
CELLULASE
CELULASA
CHEMICAL COMPOSITION
COMPOSICION QUIMICA
COMPOSITION CHIMIQUE
DNA
DNA-Binding Proteins - genetics
ESTER
ESTERES
ESTERS
EXPRESION GENICA
EXPRESSION DES GENES
EXTRACELLULAR FACTOR
FACTEUR DE TRANSCRIPTION
FACTORES DE TRANSCRIPCION
FATTY ACIDS
GENBANK/U6193[SIC]
GENE
GENE EXPRESSION
Gene Expression Regulation, Bacterial - drug effects
GENES
Genes, Bacterial
GENETIC REGULATION
GENETICA
GENETICS
GENETIQUE
Gram-Negative Aerobic Bacteria - genetics
Gram-Negative Aerobic Bacteria - pathogenicity
HISTIDINE KINASE
MOLECULAR SEQUENCE DATA
MUTACION
MUTANT
MUTANTES
MUTANTS
MUTATION
NUCLEOTIDE SEQUENCE
Palmitates - pharmacology
PECTINESTERASAS
PECTINESTERASE
PHCB GENE
PHCR GENE
PHCS GENE
POLISACARIDOS
POLYHOLOSIDE
POLYSACCHARIDES
PROTEIN KINASE
PROTEIN SYNTHESIS
PROTEINA QUINASA
PROTEINAS
PROTEINAS AGLUTINANTES
PROTEINE
PROTEINE DE LIAISON
PROTEINE KINASE
PROTEINS
PSEUDOMONACEAE
Ralstonia solanacearum
RALSTONIAN SOLANACEARUM
REGULATORY GENES
SECUENCIA NUCLEOTIDICA
Sequence Analysis
SEQUENCE NUCLEOTIDIQUE
SINTESIS DE PROTEINAS
STRUCTURAL GENES
SYNTHESE PROTEIQUE
TRANSCRIPTION FACTORS
Transcription Factors - genetics
Virulence - genetics
Viruses
title A two-component system in Ralstonia (Pseudomonas) solanacearum modulates production of PhcA-regulated virulence factors in response to 3-hydroxypalmitic acid methyl ester
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